Riot should base how much LP you gain/lose based on your grade

Like if I consistently do well in matches, I won't be penalized so hard for getting stuck with worse players, afks, or int feeders. So if we lose a game and I still perform well in my lane, lets say A or so, I lose 12 lp instead of 17. Maybe lose 10 lp for an S rank. But if I win and it's obvious that I carried, I could get maybe 25-27 lp instead of 22 or so.